Employees of the Department of Celestial Mechanics and Astrometry NII PMM and colleagues from St. Petersburg State University, Keldysh Research Center, and Research Institute Sirius are developing measures to protect the Earth from potentially dangerous celestial bodies. With the help of supercomputer SKIF Cyberia, the scientists simulated the nuclear explosion of an asteroid 200 meters in diameter in such a way that its irradiated fragments do not fall to the Earth.
TSU scientists with colleagues from other research centres have offered another solution to the problem. It is known that the majority of dangerous objects pass close to Earth several times before the collision. Therefore, there is a possibility to blow up the asteroid at the time when it is farther from the planet. This measure will be much more effective and safer.
For computer modeling as a potential target was taken a celestial body with a diameter of 200 meters, similar to the asteroid Apophis, which in 2029 will approach Earth at a distance of 38,000 kilometers. Calculations have shown that for the destruction of the object there must be the impact of a nuclear device with energy of one megaton of TNT equivalent. In this case, part of the asteroid turns into gas and liquid droplets, and some will break into pieces no larger than 10 meters. This is the maximum in terms of safety for the Earth.
Specialists from different areas who are experts in celestial mechanics and ballistics worked on the project. The scientists note that the theoretical calculations are only the beginning of the work, without which the practical implementation on the preventive measures protecting the Earth is impossible.